int* twoSum(int* nums, int numsSize, int target, int* returnSize)
{
    int * ret = NULL;
    for (int i = 0; i < numsSize; ++i)
    {
        for (int j = i + 1; j < numsSize; ++j) 
        {
            if (nums[i] + nums[j] == target) 
            {
                int* ret = (int*)malloc(sizeof(int) * 2);
                ret[0] = i, ret[1] = j;
                *returnSize = 2;
                return ret;
            }
        }
    }
    *returnSize = 0;
    return NULL;
}